GIF cropped when render with x2 effect

Here is my GIF w/ x2 effect on: https://media.giphy.com/media/cilZlcFM1vtvCBy7qg/giphy.gif

You can see that when the object touches the right edge, it was cropped off a little in several frames. But when I exported with normal pixel effect, it doesn't seem to be cropped, just right on the edge. I imported the model from magicavoxel, and it was smaller than 40x40x40.